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LP3971 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LP3971 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 42 page LDO RTC Unless otherwise noted, V IN = 3.6V, CIN = 1.0 µF, COUT = 0.47 µF, COUT (VRTC) = 1.0 µF ceramic. Typical values and limits appearing in normal type apply for T J = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation, −40˚C to +125˚C. (Notes 2, 6, 7) and (Note 10) Symbol Parameter Conditions Min Typ Max Units V OUT Accuracy Output Voltage Accuracy V IN Connected, Load Current = 1mA 2.632 2.8 2.968 V ∆V OUT Line Regulation V IN =(VOUT nom + 1.0V) to 5.5V (Note 11) Load Current=1mA 0.15 %/V Load Regulation From Main Battery Load Current=1mAto30mA 0.05 %/mA From Backup Battery V IN = 3.0V Load Current=1mAto10mA 0.5 I SC Short Circuit Current Limit From Main Battery V IN =VOUT +0.3V to 5.5V 100 mA From Backup Battery 30 V IN - V OUT Dropout Voltage Load Current = 10 mA 375 mV I Q_Max Maximum Quiescent Current I OUT =0mA 30 µA TP1 RTC LDO Input Switched from Main Battery to Backup Battery V IN Falling 2.9 V TP2 RTC LDO Input Switched from Backup Battery to Main Battery V IN Rising 3.0 V C O Output Capacitor Capacitance for Stability 0.7 1.0 µF ESR 5 500 m Ω www.national.com 8 |
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